I don't know if I'm allowed to talk about sigma lenses on a canon lens forum but it won't hurt to try.
From what I've heard, Sigma lenses have both good and bad copies? Is this true? If it is true, how bad is a bad copy? I'm planning on getting a second hand Sigma 55-200mm f/4-5.6 to compliment my 350D kitlens.
Thanks in advance for your help.I will surely appreciate it.

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